Canon is working on a medium format system, Nikon has a patent for a medium format lens. Seems that FF people think bigger not smaller is better--K.Gawdat

Think back 5 years and Canon and Nikon were selling a ton of point & shoot cameras. As we all know, camera phones are killing that market. It might be as simple as Canon/Nikon see all/most smaller sensor cameras evaporating and DX/FX/MF remaining. Hell, some think DX won't survive. Maybe in 10 years FX is the "consumer/advanced amateur" sensor size while MF is for "pro's".